:root {
      --bg: #f5f7fb;
      --bg2: #eef4ff;
      --card: #ffffff;
      --text: #0f172a;
      --muted: #64748b;
      --line: #e2e8f0;
      --primary: #2563eb;
      --primary-hover: #1d4ed8;
      --green: #16a34a;
      --green-soft: #f0fdf4;
      --blue-soft: #eff6ff;
      --amber-soft: #fff7ed;
      --amber: #c2410c;
      --shadow: 0 16px 40px rgba(15, 23, 42, 0.08);
      --radius: 24px;
    }

    * {
      box-sizing: border-box;
    }

    html {
      scroll-behavior: smooth;
    }

    body {
      margin: 0;
      font-family: Inter, -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Arial, sans-serif;
      background: linear-gradient(180deg, var(--bg2) 0%, var(--bg) 240px, var(--bg) 100%);
      color: var(--text);
      line-height: 1.55;
    }

    .wrap {
      max-width: 1120px;
      margin: 0 auto;
      padding: 20px 16px 48px;
    }

    .hero {
      padding: 28px 0 18px;
    }

    .hero-grid {
      display: grid;
      grid-template-columns: 1.2fr 0.8fr;
      gap: 18px;
      align-items: stretch;
    }

    .hero-main,
    .hero-side,
    .card,
    .seo-card {
      background: var(--card);
      border: 1px solid rgba(226, 232, 240, 0.9);
      border-radius: var(--radius);
      box-shadow: var(--shadow);
    }

    .hero-main {
      padding: 28px;
    }

    .eyebrow {
      display: inline-flex;
      align-items: center;
      gap: 8px;
      padding: 8px 12px;
      border-radius: 999px;
      background: var(--blue-soft);
      color: var(--primary);
      font-size: 12px;
      font-weight: 800;
      letter-spacing: 0.02em;
      text-transform: uppercase;
      margin-bottom: 14px;
    }

    h1 {
      margin: 0 0 12px;
      font-size: 42px;
      line-height: 1.1;
      letter-spacing: -0.03em;
    }

    .hero p {
      margin: 0;
      color: var(--muted);
      font-size: 16px;
      max-width: 720px;
    }

    .hero-bullets {
      display: flex;
      flex-wrap: wrap;
      gap: 10px;
      margin-top: 18px;
    }

    .hero-bullets span {
      padding: 10px 12px;
      border-radius: 999px;
      background: #f8fafc;
      border: 1px solid var(--line);
      font-size: 13px;
      color: var(--text);
      font-weight: 700;
    }

    .hero-side {
      padding: 22px;
      display: grid;
      gap: 14px;
      align-content: center;
      background: linear-gradient(180deg, #ffffff 0%, #fbfdff 100%);
    }

    .hero-side .mini-title {
      font-size: 13px;
      color: var(--muted);
      font-weight: 700;
      text-transform: uppercase;
      letter-spacing: 0.04em;
    }

    .hero-side .impact {
      font-size: 34px;
      font-weight: 900;
      color: var(--green);
      line-height: 1;
      letter-spacing: -0.03em;
    }

    .hero-side .small {
      color: var(--muted);
      font-size: 14px;
    }

    .layout {
      display: grid;
      grid-template-columns: 420px 1fr;
      gap: 18px;
      align-items: start;
    }

    .card {
      padding: 22px;
    }

    .section-title {
      margin: 0 0 8px;
      font-size: 24px;
      line-height: 1.2;
      letter-spacing: -0.02em;
    }

    .section-desc {
      margin: 0 0 18px;
      color: var(--muted);
      font-size: 14px;
    }

    .field {
      margin-bottom: 18px;
    }

    .label-row {
      display: flex;
      align-items: center;
      justify-content: space-between;
      gap: 10px;
      margin-bottom: 8px;
    }

    label {
      font-size: 14px;
      font-weight: 800;
    }

    .value-badge {
      font-size: 12px;
      color: var(--primary);
      background: var(--blue-soft);
      border-radius: 999px;
      padding: 6px 10px;
      font-weight: 800;
    }

    .control-row {
      display: grid;
      grid-template-columns: 1fr 120px;
      gap: 12px;
      align-items: center;
    }

    input[type="number"] {
      width: 100%;
      padding: 13px 14px;
      border: 1px solid var(--line);
      border-radius: 14px;
      background: #fff;
      color: var(--text);
      font-size: 15px;
      font-weight: 600;
    }

    input[type="number"]:focus,
    input[type="range"]:focus {
      outline: none;
    }

    input[type="number"]:focus {
      border-color: var(--primary);
      box-shadow: 0 0 0 4px rgba(37, 99, 235, 0.12);
    }

    input[type="range"] {
      width: 100%;
      accent-color: var(--primary);
      cursor: pointer;
    }

    .hint {
      margin-top: 8px;
      font-size: 12px;
      color: var(--muted);
    }

    .result-top {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 12px;
      margin-bottom: 16px;
    }

    .metric {
      border: 1px solid var(--line);
      border-radius: 20px;
      padding: 18px;
      background: #fff;
    }

    .metric.green {
      background: var(--green-soft);
      border-color: #bbf7d0;
    }

    .metric.blue {
      background: var(--blue-soft);
      border-color: #bfdbfe;
    }

    .metric.amber {
      background: var(--amber-soft);
      border-color: #fed7aa;
    }

    .metric-title {
      margin: 0 0 8px;
      font-size: 12px;
      font-weight: 800;
      color: var(--muted);
      text-transform: uppercase;
      letter-spacing: 0.04em;
    }

    .metric-value {
      margin: 0;
      font-size: 34px;
      line-height: 1;
      font-weight: 900;
      letter-spacing: -0.03em;
    }

    .metric.green .metric-value {
      color: var(--green);
    }

    .metric.blue .metric-value {
      color: var(--primary);
    }

    .metric.amber .metric-value {
      color: var(--amber);
    }

    .story {
      border: 1px solid var(--line);
      border-radius: 20px;
      padding: 18px;
      background: linear-gradient(180deg, #ffffff 0%, #f8fbff 100%);
      margin-bottom: 16px;
    }

    .story p {
      margin: 0;
      font-size: 16px;
      color: var(--text);
      font-weight: 600;
    }

    .story strong {
      color: var(--primary);
    }

    .compare-grid {
      display: grid;
      grid-template-columns: 1fr auto 1fr;
      gap: 12px;
      align-items: stretch;
      margin-bottom: 16px;
    }

    .compare-card {
      border: 1px solid var(--line);
      border-radius: 20px;
      padding: 18px;
      background: #fff;
    }

    .compare-card h3 {
      margin: 0 0 12px;
      font-size: 18px;
      letter-spacing: -0.02em;
    }

    .vs {
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: 900;
      color: var(--muted);
      font-size: 14px;
      padding: 0 4px;
    }

    .compare-list {
      display: grid;
      gap: 10px;
    }

    .compare-item {
      display: flex;
      justify-content: space-between;
      gap: 12px;
      padding-bottom: 10px;
      border-bottom: 1px solid #f1f5f9;
      font-size: 14px;
    }

    .compare-item:last-child {
      border-bottom: none;
      padding-bottom: 0;
    }

    .compare-item span:first-child {
      color: var(--muted);
      font-weight: 700;
    }

    .compare-item span:last-child {
      font-weight: 800;
      text-align: right;
    }

    .chart-card {
      border: 1px solid var(--line);
      border-radius: 20px;
      padding: 18px;
      background: #fff;
      margin-bottom: 18px;
    }

    .chart-card h3 {
      margin: 0 0 8px;
      font-size: 18px;
    }

    .chart-card p {
      margin: 0 0 14px;
      color: var(--muted);
      font-size: 14px;
    }

    .canvas-wrap {
      width: 100%;
      overflow: hidden;
      border-radius: 16px;
      background: linear-gradient(180deg, #fbfdff 0%, #f8fafc 100%);
      border: 1px solid #edf2f7;
      padding: 12px;
    }

    canvas {
      width: 100%;
      height: auto;
      display: block;
    }

    .seo-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 16px;
      margin-top: 18px;
    }

    .seo-card {
      padding: 20px;
    }

    .seo-card h2 {
      margin: 0 0 10px;
      font-size: 20px;
      letter-spacing: -0.02em;
    }

    .seo-card p {
      margin: 0;
      font-size: 14px;
      color: var(--muted);
    }

    .faq {
      margin-top: 18px;
      display: grid;
      gap: 12px;
    }

    .faq-item {
      background: #fff;
      border: 1px solid var(--line);
      border-radius: 18px;
      padding: 18px;
      box-shadow: var(--shadow);
    }

    .faq-item h3 {
      margin: 0 0 8px;
      font-size: 18px;
    }

    .faq-item p {
      margin: 0;
      color: var(--muted);
      font-size: 14px;
    }

    @media (max-width: 980px) {

      .hero-grid,
      .layout,
      .seo-grid,
      .result-top,
      .compare-grid {
        grid-template-columns: 1fr;
      }

      .vs {
        padding: 6px 0;
      }
    }

    @media (max-width: 640px) {
      .wrap {
        padding: 14px 12px 32px;
      }

      .hero-main,
      .hero-side,
      .card,
      .seo-card,
      .faq-item {
        border-radius: 20px;
      }

      .hero-main,
      .hero-side,
      .card,
      .seo-card,
      .faq-item {
        padding-left: 16px;
        padding-right: 16px;
      }

      h1 {
        font-size: 32px;
      }

      .control-row {
        grid-template-columns: 1fr;
      }

      .metric-value {
        font-size: 28px;
      }

      .story p {
        font-size: 15px;
      }
    }


    .seo-article {
      margin-top: 24px;
      padding: 24px;
      background: #ffffff;
      border-radius: 20px;
      border: 1px solid #e2e8f0;
      box-shadow: 0 10px 25px rgba(0, 0, 0, 0.05);
    }

    .seo-article h2 {
      margin: 0 0 12px;
      font-size: 22px;
    }

    .seo-article p {
      margin: 0 0 10px;
      color: #64748b;
      font-size: 14px;
    }

    /* Navigation Bar */
    .main-nav {
      background: var(--card);
      border-bottom: 1px solid var(--line);
      position: sticky;
      top: 0;
      z-index: 100;
      box-shadow: 0 4px 20px rgba(0, 0, 0, 0.02);
    }
    .nav-container {
      max-width: 1120px;
      margin: 0 auto;
      padding: 16px;
      display: flex;
      justify-content: space-between;
      align-items: center;
    }
    .logo {
      font-weight: 900;
      font-size: 20px;
      color: var(--primary);
      text-decoration: none;
      letter-spacing: -0.02em;
    }
    .nav-links {
      display: flex;
      gap: 24px;
    }
    .nav-links a {
      color: var(--text);
      text-decoration: none;
      font-weight: 600;
      font-size: 15px;
      transition: color 0.2s;
    }
    .nav-links a:hover {
      color: var(--primary);
    }

    /* Footer */
    .site-footer {
      background: #0f172a;
      color: #94a3b8;
      padding: 48px 16px 24px;
      margin-top: 40px;
    }
    .footer-container {
      max-width: 1120px;
      margin: 0 auto;
    }
    .footer-sections {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr;
      gap: 32px;
      margin-bottom: 40px;
    }
    .footer-section h4 {
      color: #f8fafc;
      font-size: 16px;
      margin: 0 0 16px;
    }
    .footer-section p {
      margin: 0;
      font-size: 14px;
      line-height: 1.6;
    }
    .footer-section ul {
      list-style: none;
      padding: 0;
      margin: 0;
      display: grid;
      gap: 12px;
    }
    .footer-section a {
      color: #94a3b8;
      text-decoration: none;
      font-size: 14px;
      transition: color 0.2s;
    }
    .footer-section a:hover {
      color: #f8fafc;
    }
    .footer-bottom {
      border-top: 1px solid #1e293b;
      padding-top: 24px;
      text-align: center;
      font-size: 13px;
    }

    @media (max-width: 640px) {
      .footer-sections {
        grid-template-columns: 1fr;
      }
      .nav-links {
        display: none; /* simple for mobile for now or handle via script */
      }
    }

    /* Contact Form */
    .contact-form {
      margin-top: 24px;
      display: grid;
      gap: 16px;
      background: #f8fafc;
      padding: 24px;
      border-radius: 16px;
      border: 1px solid var(--line);
    }
    .form-group {
      display: flex;
      flex-direction: column;
      gap: 8px;
    }
    .form-group label {
      font-size: 14px;
      font-weight: 700;
      color: var(--text);
    }
    .form-group input,
    .form-group textarea {
      width: 100%;
      padding: 12px 16px;
      border: 1px solid var(--line);
      border-radius: 12px;
      font-family: inherit;
      font-size: 15px;
      transition: all 0.2s;
    }
    .form-group input:focus,
    .form-group textarea:focus {
      outline: none;
      border-color: var(--primary);
      box-shadow: 0 0 0 4px rgba(37, 99, 235, 0.12);
    }
    .submit-btn {
      background: var(--primary);
      color: #fff;
      font-weight: 700;
      font-size: 16px;
      padding: 14px 24px;
      border: none;
      border-radius: 12px;
      cursor: pointer;
      transition: background 0.2s;
    }
    .submit-btn:hover {
      background: var(--primary-hover);
    }